Grapheme are a made up human thing that, while useful, is locale dependent. Most people when they talk about grapheme clusters mean the default "locale-independ

Grapheme are a made up human thing that, while useful, is locale dependent. Most people when they talk about grapheme clusters mean the default "locale-independent" graphemes but it's not the only one (in Hungarian for example 'ly' is a single letter). Having the same string be two different lengths in two countries is… let's go with surprising. The common denominator where everyone computes the same number is code points.